Killing Drizzt without Cheese

How do I do it?

I assumed it would be trivial-ish by endgame, but he basically kills everyone in one hit and I hit him maybe once for 5 damage during the course of all of that. He saves to all spells that are savable, mostly.

Is it just a matter of resets, or is there a win-button, where "win-button" does not mean "surround him with removed party members to trap him, then sling him to death."